Question

If we represent the distance above the ground by a positive rational number and that below the ground by negative rational number, then answer the following questions:
An elevator decends into a mine shaft at the of 4 whole 3/4 metre per minute .If it begins to descend from 7 whole 1/2 metre above the ground ,what will be it's position after 18 minutes from the ground​

Answer 1

Answer:

Step-by-step explanation:

Since downwards is negative, the velocity of the elevator is -5 m/min.

(i) Displacement = Velocity x Time = -5 m/min x 60 min = -300 m.

(ii) Displacement from initial position = Velocity x Time = -5 m/min x 45 min = -225 m.

However, since we started 15 m above ground, displacement from the ground level = -225 + 15 m = -210 m.